Abstract
Low-cost weld joint on wear-resist gear train component was introduced for replacing conventional bolted connection to avoid its additional material and holes requirement. This study was concerned on the hardness analysis of carburized steel weld joint generated from SMAW with different welding currents, namely 80, 100, and 120 A. The results indicated that the hardness is decreased at HAZ and subsequently increased at weld metal for all samples. On the other hand, the highest welding current applied during welding shows the highest hardness curve among the other currents up to 226.5±2 HV at weld metal. By micro-and macrostructural analyses, phases evolution during thermal cycle on welding process played the crucial role to determine the hardness of HAZ, while the weld metal hardness was dominantly driven by the carbon-rich element distribution.
Highlights
Gear train is one of the important parts on automobile industries having crucial role to transmit the power from main driving component to output wheels mainly suffering from bending and contact loading, superior hardness is needed to induce sufficient surface wear resistance for withstanding continously contact with other transmission elements
The superior torsional stiffness performed on differential gear made from cast iron-carburized steel joint through laser welding compared with bolted connection was revealed by either simulation
The macroscopic view of weld cross-section were provided by using digital camera.The weld microstructure was observed by optical microscope (OM) with 200 times of magnification
Summary
Gear train is one of the important parts on automobile industries having crucial role to transmit the power from main driving component (engine) to output wheels mainly suffering from bending and contact loading, superior hardness is needed to induce sufficient surface wear resistance for withstanding continously contact with other transmission elements. Due to this condition, surface-hardened material is deserved to fulfill the surface requirement but still keep the internal ductility which could be achieved by carburizing on the metals, i. The welding parameter should be selected properly to maintain the similar hardness level between carburized base metal and the weld joint, so, the homogeineous wear resistance could be performed on entire component
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